A know-it-all gets Ms. Frizzle's (Lily Tomlin) class lost in outer space.

Ms. Frizzle's students explore Arnold's digestive system after he accidentally swallows his miniaturised classmates.

While Ralphie hosts a TV broadcast from his sickbed, his classmates seek to discover the cause of his illness.

Establishing a connection between a soggy shoe and a tuna sandwich leads to an ocean field trip.

Ms. Frizzle's miniaturised class becomes a mechanical frog so it can hop along in search of Wanda's missing pet.

On "Accidental Science Project Day," the class takes a close look at what's rotting in an abandoned lot.